<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区域 -->
        <el-card>
            <!-- alert 警示框区域 -->
            <el-alert
                title="添加商品信息"
                type="info"
                center
                :closable="false"
                show-icon>
            </el-alert>
            <!-- 步骤条区域 -->
            <el-steps align-center :space="200" :active="activeIndex-0"  >
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>
            <!-- tabs栏区域 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
                <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <el-cascader
                            v-model="addForm.goods_cat"
                            :options="cateList"
                            :props="cateProps"
                            @change="handleChange"></el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <!-- 渲染表单的item项 -->
                        <el-form-item :label="item.attr_name" v-for="item of manyTableData" :key="item.attr_id">
                            <!-- 复选框组 -->
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox :label="cb" v-for="(cb,i) of item.attr_vals" :key="i" border></el-checkbox>         
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name" v-for="item of onlyTableData" :key ="item.attr_id">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <!-- action 表示图片要上传到的后台api地址 -->
                        <el-upload
                            :action="uploadURL"
                            :on-preview="handlePreview"
                            :on-remove="handleRemove"
                            :headers="headerObj"
                            :on-success="handleSuccess"
                            list-type="picture">
                            <el-button size="small" type="primary">点击上传</el-button>
                            <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!-- 富文本编辑器区域 -->
                        <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                        <!-- 添加商品按钮 -->
                        <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>
        <!-- 图片预览对话框 -->
        <el-dialog
            title="图片预览"
            :visible.sync="previewVisible"
            width="50%"
            >
            <img :src="previewPath" alt="" class="previewImg">
        </el-dialog>
    </div>
</template>
<script>
import _ from 'lodash'
export default {
    data() {
        return {
            activeIndex:'0',
            // 添加商品的表单数据对象
            addForm:{
                goods_name:'',
                goods_price:0,
                goods_weight:0,
                goods_number:0,
                goods_cat:'',
                pics:[],
                goods_introduce:'',
                attrs:[]
            },
            addFormRules:{
                goods_name:[
                    { required: true, message: '请输入商品名称', trigger: 'blur' }
                ],
                goods_price:[
                    { required: true, message: '请输入商品价格', trigger: 'blur' }
                ],
                goods_weight:[
                    { required: true, message: '请输入商品重量', trigger: 'blur' }
                ],
                goods_number:[
                    { required: true, message: '请输入商品数量', trigger: 'blur' }
                ],
                goods_cat:[
                     { required: true, message: '请选择商品分类', trigger: 'blur' }
                ]
            },
            cateList:[],
            cateProps:{
                label:'cat_name',
                value:'cat_id',
                children:'children',
                expandTrigger: 'hover'
            },
            // 动态参数列表数据
            manyTableData:[],
            // 静态属性列表数据
            onlyTableData:[],
            // 上传图片的url地址
            uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
            // 图片上传组件的请求头对象
            headerObj:{
                Authorization:window.sessionStorage.getItem('token')
            },
            previewPath:'',
            previewVisible:false

        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        // 获取所有商品列表数据
        async getCateList(){
            const {data:res} = await this.$http.get('categories')
            if(res.meta.status !==200)return this.$message.error('获取商品列表失败')
            // console.log(res.data)
            this.cateList = res.data
        },
        // 级联选择器发生变化触发的函数
        handleChange(){
            if(this.addForm.goods_cat.length !==3){
                this.addForm.goods_cat = []
            }
        },
        // tabs标签页离开前的钩子函数
        beforeTabLeave(activeName, oldActiveName){
            // console.log('即将离开的标签页的名字'+oldActiveName)
            // console.log('即将进入的标签页的名字'+activeName)
            if(oldActiveName ==='0'&&this.addForm.goods_cat.length !==3){
                this.$message.error('请先选择商品分类')
                return false
            }   
        },
        // tabs标签页点击事件
        async tabClicked(){
            //  console.log(this.activeIndex)
            // 证明访问的是动态参数面板
            if(this.activeIndex ==='1'){
                const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'many'}})
                
                if(res.meta.status !==200)return this.$message.error('获取动态参数失败')
                res.data.forEach(item =>{
                    item.attr_vals=item.attr_vals.length ===0?[]: item.attr_vals.split(' ')
                })
                this.manyTableData = res.data  
            }else if(this.activeIndex ==='2'){
                const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'only'}})
                
                if(res.meta.status !==200)return this.$message.error('获取动态参数失败')
                this.onlyTableData = res.data
                // console.log(this.onlyTableData )
            }
        },
        // 处理图片预览事件
        handlePreview(file){
            console.log(file)
            this.previewPath =file.response.data.url
            this.previewVisible = true
        },
        // 处理移除图片的事件
        handleRemove(file){
            // console.log(file)
            // 1.获取将要删除图片的临时路径
            const filePath = file.response.data.tmp_path
            // 2.从pics数组中找到这个图片对应的索引值
            const i =  this.addForm.pics.findIndex(x =>
            x.pic ===filePath)
            // 3.调用数组的splice方法，把图片信息对象从pics数组中移除
            this.addForm.pics.splice(i,1)
             console.log(this.addForm)
        },
        // 监听图片上传成功的事件
        handleSuccess(response){
            // 1拼接得到一个图片信息对象
            const picInfo ={pic:response.data.tmp_path}
            // 2将图片信息对象，push到pics数组中
            this.addForm.pics.push(picInfo)
             console.log(this.addForm)
        },
        // 添加商品
        add(){
            this.$refs.addFormRef.validate( async valid =>{
                if(!valid)return this.$message.error('请填写必要的表单项')
                // 执行添加前的业务逻辑
                // lodash cloneDeep 深克隆
                const form = _.cloneDeep(this.addForm)
                form.goods_cat = form.goods_cat.join(',')
                // 处理动态参数
                this.manyTableData.forEach(item =>{
                    const newInfo ={attr_id:item.attr_id,attr_value:item.attr_vals.join(' ')}
                    this.addForm.attrs.push(newInfo)
                })
                // 处理静态属性
                this.onlyTableData.forEach(item =>{
                    const newInfo ={attr_id:item.attr_id,attr_value:item.attr_vals}
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs = this.addForm.attrs
                // console.log(form)
                const {data:res} = await this.$http.post('goods',form)
                if(res.meta.status !==201)return this.$message.error('添加商品失败')
                this.$message.success('添加商品成功')
                this.$router.push('/goods')
                
            })
        }
    },
    computed:{
        cateId(){
            if(this.addForm.goods_cat.length ===3){
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }
}
</script>
<style lang="less" scoped>
.el-checkbox{
    margin:0 10px 0 0 !important;
}
.previewImg{
    width: 100%;
}
.btnAdd{
    margin-top: 15px;
}
</style>